是指在进行有氧锻炼时每分钟心跳次数的范围，它能反应出锻炼者的运动强度，从而能从锻炼中获得最大的健康功效。

The number of heartbeats per minute reflecting the exercise intensity that gains the maximum training benefits from an aerobic workout.

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在其他飞机试验任务期间，根据美国宇航局X - 15的飞行，飞行员的心率从145到185不等，每分钟心跳，远高于70至80个跳动到那个时候。

According to NASA, during X-15 flights, the pilots' heart rates ranged from 145 to 185 beats per minute, well above the 70 to 80 beats during test missions in other aircraft up to that time.

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训练过程中，心跳超过每分钟200次；乳酸在肌肉里聚集到酸痛的程度；肺里脆弱的毛细血管都会破裂。

As they train, hearts race at over 200 beats a minute; lactic acid builds to stinging levels in muscles; fragile capillaries burst in the lungs.

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